This method allows you to open one of the primary mailbox folders ( Calendar, Contacts, Inbox, Journal, Notes, or Tasks) in a separate window that will not reappear the next time you start Outlook: Open another's calendar or mailbox folders on demand Allow others to send mail on your behalf in Outlook for Windows.Share your Windows Outlook calendar or folders.For more about sharing Exchange calendars and mailbox folders, see: To set up sharing, those users must give you the 'Reviewer' permission level (at least) for their calendars or mailbox folders either by modifying their respective permissions, or by configuring delegate access for you. You can use Microsoft Outlook to view the Exchange calendar and mailbox folders of others within IU only if they have shared them with you.